Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1989-06-02
1990-06-05
Jordan, Charles T.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
89 1817, 102293, 264 12, 501120, F41G 726, F42C 1904, B29D 1100, C04B 3562
Patent
active
049307312
ABSTRACT:
A dome and window for missiles and launch tubes is provided having high ultraviolet transmittance and high strength properties. The domes and windows have, in their uncoated state, and with a thickness of about 1.88 mm, a transmittance greater than about 80%, preferably greater than about 82%, and more preferably greater than about 85%, at a wavelength of 0.4 microns to 0.5 microns. The domes and windows preferably have a transmittance per 1.88 mm thickness at all wavelengths in the wavelength range between 3.0 microns and 4.0 microns of at least about 81%. The domes and windows have a flexural strength of at least about 20,000 psi and a knoop hardness of at least about 1350 kg mm.sup.-2. The domes and windows are formed of a transparent, sintered polycrystalline magnesia-alumina spinel. The polycrystalline sintered spinel is formed in a two-step process comprising forming a closed porosity body such as by hot-pressing or pressureless sintering followed by a hot isostatic pressure treatment step to reduce residual porosity to less than about 0.001 percent.
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Hastert James L.
Roy Donald W.
Carone Michael J.
Coors Porcelain Company
Jordan Charles T.
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